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3.4.7 DLT input
To protect the compressor against high discharge temperatures it is possible to connect a discharge
line temperature sensor (DLT) between control terminals 1 and 2. This sensor input is configurable
via register [207]. By default, it is disabled.
Sensor specifications:
▪ Type:
NTC 10 kΩ @ 25 °C
▪ Accuracy:
± 1 %
▪ Powered by: Internal 5 VDC (terminal 2)
▪ Temp. range: -40 to +150 °C
▪ Reference:
Emerson TP1 series
The sensor should be mounted on the discharge line approx. 120 mm away from the compressor
outlet.
After starting the compressor, the drive observes the temperature from the DLT sensor. The
observable temperature range is between -40 and 150 °C.
3.4.8 STO input
An STO input (Safety Torque Off) is available between terminals 3 and 4 to connect a safety high-
pressure limiter. The input is designed as a protected electronic circuit (PEC) based on the safety
standard EN 60335-1. In case of a high-pressure situation the drive will let the compressor stop
immediately. The drive will remain in a safe state until the controller sends a clear fault command to
the drive.
NOTE: It is not allowed to use any other external power supply with a higher voltage rating to
avoid damaging the STO input!
High-pressure limiter specifications:
▪ Type:
Safety switch (NC, ie, normally closed; based on latest version of EN 12263)
▪ Contacts:
Golden plated contacts
▪ Powered by: Internal 24 VDC (terminal 4)
▪ Current flow: Typically ~10 mA
▪ Reference:
Emerson PS4 series
Caution: Connect the safety limiter directly to terminals 6 and 7 without any relay etc. in
between. Otherwise the safety will probably not be safeguarded any longer.
3.4.9 Modbus communication
The drive acts as a Modbus slave with a pre-selected address 45. The serial communication between
drive and any kind of controller or user interface is physically driven via RS485 (control terminals 5,
6 and 7) and logically via the Modbus RTU protocol. If a master controller needs to be supplied with
5 VDC the control terminal 8 can be used.
During start-up cycle, if the auto-adaptive function is enabled, the drive can automatically detect the
baud rate and parity. If communication auto-adaptive function is not enabled, the drive will use baud
rate and parity read from EEPROM. Further information is provided in the Modbus map.
3.4.10 Drive cooling control
The drive provides temperature values from the power modules mounted on the heatsink. These
values should be used to monitor and control proper drive cooling from system side.
Dedicated registers for temperature sensing:
▪ [70]: PIM Temperature
▪ [22]: PIM Overtemperature
▪ [42]: PIM Speed-drop protection limit
Exceeding the overtemperature limit (register [22]) the drive will immediately shut down the
compressor. When the temperature of the power module reaches 80 °C (stored in register [42]), the
fan starts close to full-speed and then gradually reduces its speed, while the temperature of the
module decreases. The fan will stop only if the drive is turned off.
10
AGL_Sol_EV3_E_Rev_02
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